Citrus Red 2

Description

Citrus Red 2 · CAS 6358-53-8 · C18H16N2O3. UNII 2QE5Y68984. Melting Point: 311 to 315 °F (NTP, 1992); Melting Point: 156 °C; Color Additive Status: 74.302.

Identification

CAS Registry Number	6358-53-8
PubChem CID	22830
Molecular formula	C18H16N2O3
IUPAC name	1-[(2,5-dimethoxyphenyl)diazenyl]naphthalen-2-ol
UNII (FDA)	2QE5Y68984

Computed Descriptors

Molecular Weight	308.3
XLogP3	4.5
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	4
Exact Mass	308.11609238
Monoisotopic Mass	308.11609238
Topological Polar Surface Area	63.4
Heavy Atom Count	23
Formal Charge	0

Physical & Chemical Properties

Melting Point	311 to 315 °F (NTP, 1992)
Melting Point	156 °C
Color Additive Status	74.302

Physical description & handling notes

• Citrus red no. 2 appears as orange to yellow solid or dark red powder. (NTP, 1992)
• Orange to yellow or dark red solid; [CAMEO] Red crystalline solid; [MSDSonline]
• Orange to yellow solid or dark red powder (NTP, 1992)
• Crystals
• less than 1 mg/mL at 72 °F (NTP, 1992)
• Partially soluble in ethanol and vegetable oils

Regulatory Status

Regulatory & Food Contact	FDA Regulatory Status of Color Additives: Foods FDA Substance added to food: COLOR OR COLORING ADJUNCT FDA Cumulative Estimated Daily Intake (CEDI): FCS COLOUR: Food Additives CITRUS RED NO. 2 OR 2-?NAPHTHALENOL, 1-?[2-?(2,?5-?DIMETHOXYPHENYL)?DIAZENYL]?- NOT TO BE USED

GHS Hazard Classification

Reported hazard statements	H351 (100%)

Documented Uses

• Used formerly as dye for orange skins that are not processed; [HSDB]
• Considered unsafe for food use by FAO/WHO committee in 1973; [HSDB]
• Citrus Red No. 2 shall be used only for coloring the skins of oranges that are not intended or used for processing (or if so used are designated in the trade as Packinghouse elimination) and that meet minimum maturity standards established by or under the laws of the States in which the oranges are grown.
• Food Additives -> COLOUR -> JECFA Functional Classes
• /Citrus Red No. 2/ is synthesized commercially by coupling diazotization of 2,5-dimethoxyaniline with 2-naphthol.
• 100% AS DYE FOR COLORATION OF MATURE CITRUS FRUITS (E.G., ORANGES) (1974)

Synonyms

6358-53-8; C.I. Solvent Red 80; DTXSID6024838; DTXCID10809925; RefChem:1080572; CITRUS RED 2; Solvent red 80; 1-((2,5-Dimethoxyphenyl)diazenyl)naphthalen-2-ol; Citrus Red; Citrus Red No. 2; 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol; 1-(2,5-Dimethoxyphenylazo)-2-naphthol; CI Solvent Red 80; Cerven rozpoustedlova 80; 1-(2,5-Dimethyloxyphenylazo)-2-naphthol; 1-[(2,5-dimethoxyphenyl)diazenyl]naphthalen-2-ol

Frequently Asked Questions

What are the CAS number and molecular formula of Citrus Red 2?

CAS 6358-53-8; molecular formula C18H16N2O3; molecular weight — g/mol.

What other names is Citrus Red 2 known by?

6358-53-8, C.I. Solvent Red 80, DTXSID6024838, DTXCID10809925, RefChem:1080572, CITRUS RED 2.

What is the regulatory status of Citrus Red 2?

Documented regulatory listings: FDA Regulatory Status of Color Additives: Foods; FDA Substance added to food: COLOR OR COLORING ADJUNCT; FDA Cumulative Estimated Daily Intake (CEDI): FCS.

Is Citrus Red 2 classified as hazardous?

Hazard statements reported: H351.

What are the key physical properties of Citrus Red 2?

Melting Point: 311 to 315 °F (NTP, 1992); Melting Point: 156 °C; Color Additive Status: 74.302.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.